US10047764B2 - Propeller fan, and air blower, air conditioner, and hot-water supply outdoor unit including the same - Google Patents

Propeller fan, and air blower, air conditioner, and hot-water supply outdoor unit including the same Download PDF

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Publication number
US10047764B2
US10047764B2 US14/417,894 US201314417894A US10047764B2 US 10047764 B2 US10047764 B2 US 10047764B2 US 201314417894 A US201314417894 A US 201314417894A US 10047764 B2 US10047764 B2 US 10047764B2
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Prior art keywords
blade
propeller fan
outer peripheral
fan according
peripheral end
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US14/417,894
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US20150176597A1 (en
Inventor
Takahide Tadokoro
Yasuaki Kato
Atsushi Kono
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Assigned to MITSUBISHI ELECTRIC CORPORATION reassignment MITSUBISHI ELECTRIC CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KONO, ATSUSHI, KATO, YASUAKI, TADOKORO, TAKAHIDE
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/16—Sealings between pressure and suction sides
    • F04D29/161—Sealings between pressure and suction sides especially adapted for elastic fluid pumps
    • F04D29/164—Sealings between pressure and suction sides especially adapted for elastic fluid pumps of an axial flow wheel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00—Axial-flow pumps
    • F04D19/002—Axial flow fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades
    • F04D29/384—Blades characterised by form
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/545—Ducts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/301—Cross-sectional characteristics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/307—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the tip of a rotor blade
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T50/00—Aeronautics or air transport
    • Y02T50/60—Efficient propulsion technologies, e.g. for aircraft

Definitions

  • the present invention relates to a propeller fan, and an air blower, an air conditioner, and a hot-water supply outdoor unit including the propeller fan.
  • Patent Literature 1 discloses such a propeller fan that a part of the propeller fan on an outer peripheral side thereof is formed into a concave arc shape in a blade cross section, and the radius of curvature of the arc is increased as approaching from a leading edge to a trailing edge so as to suppress generation of a blade tip vortex caused by a leakage flow directed from a leeward side to a windward side.
  • Patent Literature 2 discloses such a configuration that a force applied from a blade to air is directed inwardly by tilting the blade to a downstream side as approaching toward a trailing edge so that air blow speed is made uniform to suppress noise.
  • Patent Literature 1 there is a risk in that the blade tip vortex generated from the outer peripheral portion of the blade interferes with a bellmouth while flowing to the downstream side, thereby increasing noise.
  • the bellmouth is set on an outer peripheral side of the propeller fan used in air conditioners, and the clearance between the bellmouth and the outer periphery of the fan is generally as narrow as about 5 mm to about 10 mm so that noise may increase when a disturbed air current impinges against the bellmouth. Further, the loss of energy is also caused due to the friction resistance generated between the swirling air current and the bellmouth.
  • a propeller fan including: a boss including a rotation axis; a plurality of blades formed on an outer periphery of the boss; and a bellmouth arranged so as to surround the plurality of blades at a trailing edge side of each of the blades.
  • the blade has a bending portion that bulges toward an upstream side in a cross-sectional shape in a radial direction.
  • a tangent at an end of the outer periphery is defined as LQ
  • an imaginary line orthogonal to the rotation axis O is defined as LO
  • an angle formed by the tangent LQ and the imaginary line LO is defined as an outer peripheral end tangent angle ⁇
  • a position at which an imaginary plane including a position of an intake-side end portion of the bellmouth and a peripheral edge of the blade cross each other is defined as an overlap starting point
  • the outer peripheral end tangent angle ⁇ on a trailing edge portion side with respect to a blade cross section including the overlap starting point is set to be smaller than the outer peripheral end tangent angle ⁇ on a leading edge portion side with respect to the blade cross section including the overlap starting point.
  • the propeller fan of the present invention it is possible to achieve lower noise by suppressing the leakage flow of the air current, and to achieve higher efficiency by increasing the rate of air to be blown.
  • FIG. 1 is a perspective view of a propeller fan according to a first embodiment of the present invention when seen from a downstream side.
  • FIG. 2 is a view of the propeller fan of FIG. 1 when seen from a lateral side.
  • FIG. 3 is a view of the propeller fan of FIG. 1 when seen from a direction of a rotation axis.
  • FIG. 4 is a radial sectional view taken along the line IV-IV of FIG. 3 .
  • FIG. 5 are radial sectional views of the vicinity of a leading edge of a blade of the propeller fan.
  • FIG. 6 are radial sectional views illustrating a backward side with respect to FIG. 5 in the same manner as that of FIG. 5 .
  • FIG. 7 are radial sectional views of the vicinity of a trailing edge of the blade of the propeller fan.
  • FIG. 8 is a view illustrating a relationship between an outer peripheral end tangent angle ⁇ and a point T at a position from a leading edge to a trailing edge according to a second embodiment of the present invention.
  • FIG. 9 is a view illustrating cross sections of a blade at T 0 , T 1 , T 2 , and T 3 .
  • FIG. 10 are views illustrating a state of a flow leaking to an outer side and an inner side in the vicinity of the leading edge of the blade.
  • FIG. 11 is a view illustrating a third embodiment of the present invention in the same manner as that of FIG. 8 .
  • FIG. 12 is a view illustrating the third embodiment of the present invention in the same manner as that of FIG. 9 .
  • FIG. 13 is a radial sectional view of a blade of a propeller fan according to a fourth embodiment of the present invention.
  • FIG. 1 is a perspective view of a propeller fan according to a first embodiment of the present invention when seen from a downstream side.
  • a propeller fan 1 a plurality of blades 3 are arranged around a boss 2 set at a rotation axis O.
  • the arrow denoted by reference symbol 4 indicates a rotation direction.
  • a peripheral edge of each of the blades 3 includes a leading edge 5 positioned on a forward side in the rotation direction, a trailing edge 6 positioned on an opposite side of the leading edge 5 , and an outer side edge 7 positioned on a radially outer side so as to connect the leading edge 5 and the trailing edge 6 to each other.
  • the arrow denoted by reference symbol 8 indicates an air current direction.
  • FIG. 2 is a view of the propeller fan of FIG. 1 when seen from a lateral side.
  • the propeller fan 1 is illustrated so that a rotation locus is projected on a surface including the rotation axis O.
  • the propeller fan 1 is arranged so as to be surrounded by an annular bellmouth 9 from outside in the radial direction. A predetermined clearance is secured between the propeller fan 1 and the bellmouth 9 .
  • an upstream side A and a downstream side B of the propeller fan 1 are partitioned by the bellmouth 9 . Further, as illustrated in FIG. 2 , the propeller fan 1 also includes a region not surrounded by the bellmouth 9 . Assuming that an imaginary plane 10 a has the rotation axis O as a normal to the imaginary plane 10 a and includes a position of an intake-side end portion 9 a of the bellmouth 9 , a position where the imaginary plane 10 a and the peripheral edge of the blade 3 cross each other is referred to as an overlap starting point 10 in the description. In FIG. 2 , a region of each of the blades 3 on the upstream side with respect to the overlap starting point 10 is not surrounded by the bellmouth 9 and is kept open in a space on the upstream side A.
  • FIG. 3 is a view of the propeller fan when seen from a direction of the rotation axis
  • FIG. 4 is a radial sectional view taken along the line IV-IV of FIG. 3
  • a blade surface on the downstream side with respect to the air current direction serves to push an air current by the rotation of the fan and is referred to as a pressure surface 11 or a positive pressure surface
  • a blade surface on the upstream side with respect to the air current direction is referred to, on the other hand, as a negative pressure surface 12 .
  • each of the blades 3 has a bending portion 13 that bulges toward the upstream side of a blade cross section, that is, on the negative pressure surface 12 side.
  • An apex of the bending portion 13 is defined as “P”.
  • an outer peripheral end of the blade on the radially outer side with respect to the apex P when seen in the blade cross section is defined as “Q”.
  • a tangent on the outer peripheral end Q of the blade is defined as “LQ”
  • an imaginary line orthogonal to the rotation axis O when seen in the blade cross section is defined as “LO”.
  • An angle formed by the two lines LQ and LO is defined as an outer peripheral end tangent angle ⁇ .
  • the outer peripheral end tangent angle ⁇ is an angle formed by a part of the imaginary line LO on an outer peripheral side with respect to the intersection IP and a part of a line segment of the tangent LQ in a range between the outer peripheral end Q of the blade and the intersection IP.
  • one of the features of this embodiment resides in that the outer peripheral end tangent angle ⁇ in the trailing edge portion is smaller than that in the leading edge portion, that is, the outer peripheral end tangent angle ⁇ becomes smaller toward the trailing edge portion.
  • one of the features of this embodiment resides in that, when a position of the blade cross section including the above-mentioned overlap starting point 10 is defined as a corresponding point of the overlap starting point, the outer peripheral and tangent angle ⁇ on the trailing edge portion side with respect to the corresponding point of the overlap starting point is smaller than the outer peripheral end tangent angle ⁇ on the leading edge portion side with respect to the corresponding point of the overlap starting point.
  • the diameter of the boss is about 30% of the diameter of the fan
  • the apex P of the bending portion 13 is set at a position away from the rotation axis O by about 60% or more of the radius so as to serve to suppress a flow leaking from the outer periphery of the blade.
  • the outer peripheral end of the blade serves as a swept blade mounted on the downstream side.
  • FIG. 5( b ) illustrates a cross section in a radial direction taken along the line V-V of FIG. 5 ( a ) .
  • the leading edge of the blade has, in most cases, a shape that extends further forward in the rotation direction toward the outer periphery side, and as illustrated in FIG. 5( a ) , the entire cross section from the boss to the outer peripheral edge may not appear in the cross section in the radial direction connecting the rotation center to the leading edge.
  • the apex of the bending portion is set at a position away from the rotation axis O by about 60% or more of the radius as described above, and hence a cross-sectional shape is considered within a range in which the blade cross section on an outer side of from about 50% to about 90% of a radius Ro of the fan appears.
  • the “leading edge portion” and the “trailing edge portion” as used herein respectively refer to a cross section on the most leading edge side and a cross section on the most trailing edge side in the range in which the blade cross section appears as described above.
  • FIGS. 6 and 7 are views illustrating the blade in the same manner as that of FIG. 5 .
  • FIGS. 6( b ) and 7( b ) illustrate cross sections in a radial direction respectively taken along the lines VI-VI and VII-VII of FIGS. 6( a ) and 7( a ) corresponding thereto.
  • FIG. 6 illustrate a position on a backward side in the rotation direction with respect to FIG. 5
  • FIG. 7 illustrate a position on a further backward side in the rotation direction with respect to FIG. 6 .
  • an outer peripheral end tangent angle ⁇ a is large, and a normal to the blade surface on the outer peripheral side with respect to the bending portion is directed to the inner peripheral side (rotation axis side). Therefore, when the air current flowing onto the pressure surface 11 passes by the bending portion 13 , a force 14 a applied from the blade to the air current works at the inner side. As a result, an air current 8 in in the vicinity of the leading edge is gathered toward the rotation axis of the fan, and thus a large amount of air current is supplied to the downstream side, that is, the increase in air-blowing rate is achieved.
  • the normal to the blade surface is directed to the inner peripheral side, and thus an air current 8 a flows along the blade surface without leaking from the outer periphery of the blade so that energy is supplied to the air current from the blade. Further, the leakage flow hardly occurs, and hence a vortex generated at an end of the blade can be suppressed, and noise can be reduced with the disturbance of the flow being suppressed. Further, the air current 8 in gathered as described above joins the air current 8 a flowing along the blade surface without leaking from the outer periphery of the blade, and thus a larger amount of air current is supplied to the downstream side. Also with this, the air-blowing rate can be further increased.
  • an outer peripheral end tangent angle ⁇ b is smaller than the above-mentioned angle ⁇ a on the leading edge side, and the normal to the blade surface of the bending portion 13 is directed in the axial direction compared to the leading edge side. Therefore, the air current receives a force 14 b in the axial direction. As a result, a flow 8 b of the air current, which has flowed on the blade surface to increase in energy, is pushed out to the downstream side from the blade surface. In this case, the trailing edge side is surrounded by the bellmouth.
  • the friction is suppressed on the trailing edge side by rapidly discharging the air current in the overlapping region between the trailing edge side and the bellmouth in the axial direction.
  • the air current flowing on the pressure surface is prevented from leaking to the outer periphery with the bending portion that bulges toward the upstream side so that the air current is allowed to flow along the blade surface so as to be supplied with energy.
  • the angle of the bending portion is set to be gentler toward the trailing edge portion, and the direction of the normal to the blade surface is directed in the axial direction so that the air-blowing rate can be increased while the loss of energy caused by the friction between the air current and bellmouth is suppressed. Further, the leakage flow is suppressed, and hence the disturbance of the air current is suppressed so as to reduce the noise.
  • FIG. 8 is a view illustrating a relationship between an outer peripheral end tangent angle ⁇ and each point T at a position from a leading edge to a trailing edge according to the second embodiment.
  • FIG. 9 is a view illustrating cross sections of a blade at T 0 , T 1 , T 2 , and T 3 .
  • the outer peripheral end tangent angle ⁇ takes a constant value up to the point T 1 located between the leading edge portion T 0 and the trailing edge portion T 3 and then decreases from the point T 1 to the trailing edge portion T 3 .
  • the outer peripheral end tangent angle ⁇ decreases linearly.
  • the outer peripheral end tangent angle ⁇ is constant as indicated by ⁇ 1 in the blade cross sections at the leading edge portion T 0 and the point T 1 , and the outer peripheral end tangent angle ⁇ decreases to an angle ⁇ 2 and an angle ⁇ 3 respectively from the point T 1 to the points T 2 and T 3 .
  • a chord length of the propeller fan is longest on the outer peripheral side, and as illustrated in FIG. 10( a ) , on the upstream side, only a part of the blade cross section appears in the cross section in the radial direction. Consequently, the air current leaks easily from the blade. As illustrated in FIG. 10( a ) , on the upstream side, only a part of the blade cross section appears in the cross section in the radial direction. Consequently, the air current leaks easily from the blade. As illustrated in FIG.
  • the outer peripheral end tangent angle ⁇ is kept constant from the leading edge portion T 0 to the point T 1 on the way to the downstream side so that the air current does not leak to the radially outer side, and thus the energy is supplied to the air current without fail.
  • the angle ⁇ from the point T 1 that is the terminal of the constant value ⁇ 1 to the trailing edge portion T 3 may also decrease in a smooth curved line as indicated by a broken line instead of decreasing in a straight line as illustrated in FIG. 8 .
  • a pressure difference between the pressure surface and the negative pressure surface increases, and hence the formed angle is decreased gently so as to prevent the leakage of the air current.
  • the angle ⁇ may be decreased more rapidly compared to the above-mentioned solid-line embodiment so as to push out the air current to the downstream side. It is appropriate that the angle be decreased so as to be suited to the environment in which the fan is used.
  • the air-blowing rate can be increased and the occurrence of the leakage and the generation of a vortex can be suppressed more efficiently while achieving lower noise.
  • FIGS. 11 and 12 are views illustrating the third embodiment respectively corresponding to FIGS. 8 and 9 .
  • a point T 4 of FIG. 11 is a corresponding point of an overlap starting point located at a position of the blade cross section including the above-mentioned overlap starting point 10 .
  • the outer peripheral end tangent angle ⁇ takes a constant value from the leading edge point T 0 to the corresponding point T 4 of the overlap starting point and then decreases from the corresponding point T 4 to the trailing edge portion T 3 . In the illustrated example of FIG. 11 , the outer peripheral end tangent angle ⁇ decreases linearly.
  • the outer periphery of the propeller fan 201 is kept open in a space from the leading edge portion T 1 to the corresponding point T 4 of the overlap starting point that overlaps the bellmouth, and hence the air current leaks easily to the outer side. Therefore, the outer peripheral end tangent angle ⁇ is kept constant from the leading edge portion T 1 to the corresponding point T 4 of the overlap starting point so as to suppress the leakage of the air current. Then, the outer peripheral end tangent angle ⁇ is decreased to ⁇ 2 and ⁇ 3 respectively from the corresponding point T 4 of the overlap starting point to the point T 2 and the trailing edge portion T 3 on the downstream side. Note that, the process of decreasing the angle is the same as that in the above-mentioned second embodiment.
  • the same advantages as those in the second embodiment are obtained, and further, in the third embodiment, in particular, the effect of suppressing the leakage in the open region of the propeller fan 201 efficiently can be obtained.
  • FIG. 13 is a radial sectional view of a blade of a propeller fan according to the fourth embodiment.
  • an outer peripheral bending portion 15 that bulges toward the downstream side is formed in an outer peripheral portion of the blade 3 with respect to the bending portion 13 .
  • the outer peripheral end tangent angle ⁇ is also the same as any of the above-mentioned first to third embodiments.
  • the pressure difference between a pressure surface lie and a negative pressure surface 12 a in a vicinity 15 a of an outer peripheral edge at the outer side with respect to the outer peripheral bending portion 15 is reduced so as to weaken a vortex (blade tip vortex 16 ) generated due to the leakage of the air current from the outer peripheral portion.
  • the outer peripheral bending portion 15 is used in addition so that the air current can be prevented from generating a strong vortex even in the case of the leakage of the air current, and thus the disturbance of the air current in the case of the leakage thereof is minimized to further reduce the disturbance of the air current that is caused by the vortex, thereby achieving lower noise.
  • the air current is prevented from generating a strong vortex even in the case of the leakage of the air current, considering also the state after the air current leaks, thereby being capable of achieving still lower noise.
  • the propeller fans according to the above-mentioned embodiments relate to the higher efficiency and the lower noise of the propeller fans.
  • the propeller fans are mounted on air blowers, highly efficient air blowing and an increase in air-blowing rate can be achieved.
  • the propeller fans are mounted on air conditioners and hot-water supply outdoor units, which are refrigerating cycle devices including compressors and heat exchangers, the amount of an air current passing through the heat exchanger can be increased also due to the highly efficient air blowing, and hence the energy saving of the devices can be realized.
  • any of the air blowers, air conditioners, and hot-water supply outdoor units there is no particular limit to the configurations other than those of the propeller fans, and for example, well-known and existing configurations may be used.
US14/417,894 2012-08-10 2013-07-18 Propeller fan, and air blower, air conditioner, and hot-water supply outdoor unit including the same Active 2035-02-17 US10047764B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JPPCT/JP2012/070507 2012-08-10
PCT/JP2012/070507 WO2014024305A1 (ja) 2012-08-10 2012-08-10 プロペラファン、並びに、それを備えた送風機、空気調和機及び給湯用室外機
WOPCT/JP2012/070507 2012-08-10
PCT/JP2013/069505 WO2014024654A1 (ja) 2012-08-10 2013-07-18 プロペラファン、並びに、それを備えた送風機、空気調和機及び給湯用室外機

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US20150176597A1 US20150176597A1 (en) 2015-06-25
US10047764B2 true US10047764B2 (en) 2018-08-14

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US (1) US10047764B2 (ja)
EP (1) EP2884114B1 (ja)
JP (1) JP5933721B2 (ja)
CN (1) CN104520593B (ja)
WO (2) WO2014024305A1 (ja)

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WO2014010058A1 (ja) * 2012-07-12 2014-01-16 三菱電機株式会社 プロペラファン、並びに、それを備えた送風機、空気調和機及び給湯用室外機
JP6902315B2 (ja) 2015-07-07 2021-07-14 プラクレンツ エルエルシー 光触媒清浄のための反応コアシステム
JP6524331B2 (ja) * 2016-02-24 2019-06-05 三菱電機株式会社 送風機及びそれを用いた空気調和機
JP6849366B2 (ja) 2016-09-29 2021-03-24 山洋電気株式会社 リバーシブルフローファン
US20200240430A1 (en) * 2017-10-03 2020-07-30 Mitsubishi Electric Corporation Propeller fan and axial flow blower
FR3078116B1 (fr) * 2018-02-22 2021-09-10 Ksb Sas Pompe a doigt
JP6625291B1 (ja) * 2018-12-26 2019-12-25 三菱電機株式会社 羽根車、送風機及び空気調和機
JP7292405B2 (ja) * 2019-11-12 2023-06-16 三菱電機株式会社 軸流ファン、送風装置、及び、冷凍サイクル装置
WO2022191034A1 (ja) * 2021-03-12 2022-09-15 ダイキン工業株式会社 プロペラファンおよび冷凍装置

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JPWO2014024654A1 (ja) 2016-07-25
CN104520593B (zh) 2016-08-17
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EP2884114A4 (en) 2016-03-09
EP2884114A1 (en) 2015-06-17
JP5933721B2 (ja) 2016-06-15
CN104520593A (zh) 2015-04-15
WO2014024654A1 (ja) 2014-02-13
WO2014024305A1 (ja) 2014-02-13

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